[TechAssist] Re: transistor
- From: "Premium Technologies" <premtech@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 22 Jan 2002 00:53:25 -0800
I agree, looking at several note here and getting tires sorry, saw it after
I sent it and it was too late... I agree with your cap tip also. C4108
especially, and taking an ESR reading on all of those you listed... The
regulator and caps are most likely the cause and Q4101 was a symptom...
Thanks Perry, good catch...
----- Original Message -----
From: "Electric Medic" <info@xxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, January 22, 2002 12:45 AM
Subject: [TechAssist] Re: transistor
>
> Bill:
> I have never seen a stk-730 IC in a CTC169 chassis. His set should use
the
> Chopper transistor Q4101. He needs to change the Regulator IC U4101 and
> C4108.
> Q4101 is Chopper transistor in power supply. The fix is:
> Change C4108 which causes high bias on Q4101 (200165)
> and its failure. Also replace U4101(200419). Do not sub Chopper or IC.
Done
> 100's of these, if you do not replace IC and C4108, the set will recall in
> most cases. Also change C4118 and C4102 The main thing to check is
> your B+ in stand by which all of the above caps, if defective, will go as
> high as 200 volts (it's supposed to be approximately 140 volts)
> Perry Bower
> Electric Medic
> "It's Cheaper to Keep Her"
> 3850 Washington Road Suite 5b
> Martinez, Georgia 30907
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> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Premium
> Technologies
> Sent: Tuesday, January 22, 2002 3:39 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: transistor
>
>
>
> Frank,
> Your original Q4101 should have been a D2012, and from a quick glance at
the
> two spec sheets NTE2311 should have worked, so I would guess that's not
your
> problem, just a symptom. Check your regulator U4101, which should be a
> STK730-010 and will cross with a NTE7125. Also check CR4122 and your 333k
> resistor at R4110, which may be taking a quite a stress if it is your
> regulator.
> Hope this helps...
> Bill
> Premium Technologies
> Ocean Park, Washington
> ----- Original Message -----
> From: "Frank Miranda" <magicll@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, January 21, 2002 11:34 PM
> Subject: [TechAssist] transistor
>
>
> >
> >
> >
> >
> >
> >
> > I'm working in CTC169JA5,I find in short Q 4101, and replace for
NTE2311,
> > thetv no working. and find CR4118 with leak, only have 7.2 volt ,
replace
> > fornew one an voltage is ok 15.0 volt, the TV star and work for only 25
> min.
> > and Q4101 is blown again. Do you have answer about the transistor ? or I
> > haveother problem ?
> >
> > Thank a lot
> >
> > Frank Miranda
> >
> > Audio Video spot
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
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